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Laser cutting of Kevlar laminates: First and second law analysis
Bekir S. Yilbas,Ahmet Z. Sahin,C. Chatwin,Tahir Ayar 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.4
Kevlar laminates are difficult to machine using conventional machining methods because of their thermal and mechanical properties. Laser cutting offers advantages over conventional machining methods, such as precision of operation, non-frictional processing, and operational cost. This provides the motivation for the present study, which reports on laser cutting of Kevlar laminates of different thicknesses. The first and second law efficiencies of the cutting process are formulated and predicted in line with the experimental parameters. The laser cut surfaces are examined using optical and electron scanning microscopes. It is demonstrated that the first and second law efficiencies improve at high laser cutting speeds and low laser output power levels. For these conditions parallel sided kerfs with no sideways burning are produced.
Vildan Altunayoglu Cakmak,Sibel Gazioglu,Nuray Can Usta,Ahmet Ayar,Murat Topbas,Cavit Boz,Evrim Ozkorumak 대한신경과학회 2014 Journal of Clinical Neurology Vol.10 No.4
Background and Purpose Restless legs syndrome (RLS) is a common sleep-related movement disorder that is frequently associated with psychological disturbances. Personality traitsare of considerable importance with respect to coping with chronic illness and disease vulnerability. This study assessed the temperament and character traits of RLS patients using an approach that involves the psychobiological model of personality. Methods The personality features of 65 newly diagnosed and untreated RLS patients with noneurological or psychiatric diseases and 109 healthy controls were determined using the Temperament and Character Inventory and compared using covariance analyses. The InternationalRLS Study Group Severity Scale was used to assess the severity of the RLS symptoms, and theBeck Depression Inventory was used to assess the presence and severity of depressive symptoms. Results RLS patients scored significantly higher than healthy controls on the temperamentdimension of harm avoidance (HA, p=0.02) and significantly lower on self-directedness (SD,p=0.001). No significant difference was observed in terms of the temperament dimension ofnovelty seeking (p=0.435). HA scores were significantly correlated with the BDI score but notwith the RLS severity or duration. Conclusions High HA and low SD scores are the main characterizing personality features ofRLS patients. These personality dimensions may be among the factors predisposing patients todevelopment of the depressive symptoms that are frequently associated with RLS.